Can't turn personal hotspot off?

I have iPhone 4 (not 4s) and in my settings it said personal hotspot do I clicked on it, it took me to another page and I turned on, it then took me back to the main settings page. I then didn't know how to use it because I didn't read instructions just turned it on…

Now I want to turn it back off but the button isn't there anymore (in the main setting page the "personal hotspot" is gone.

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